78876911 has 4 divisors (see below), whose sum is σ = 79155912. Its totient is φ = 78597912.

The previous prime is 78876901. The next prime is 78876929. The reversal of 78876911 is 11967887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78876911 - 2¹⁰ = 78875887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78876901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139076 + ... + 139641.

It is an arithmetic number, because the mean of its divisors is an integer number (19788978).

Almost surely, 2^78876911 is an apocalyptic number.

78876911 is a deficient number, since it is larger than the sum of its proper divisors (279001).

78876911 is a wasteful number, since it uses less digits than its factorization.

78876911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279000.

The product of its digits is 169344, while the sum is 47.

The square root of 78876911 is about 8881.2674208133. The cubic root of 78876911 is about 428.8610765426.

The spelling of 78876911 in words is "seventy-eight million, eight hundred seventy-six thousand, nine hundred eleven".